SOCS

In recent years, our understanding of rotation in relation to the ages of cool stars has advanced significantly. Recent space-based observations have pushed the age limits of previous studies close to the age of the Sun, and confirmed and expanded previous ground-based studies of the closest and best-studied open star clusters. However, there is no prospect of more studies of other important star clusters that would allow the investigation of various aspects of the evolution of the rotation, fill the parameter space more densely and cover more ages. In particular, we are interested in understanding the important transition from fast to slow rotation of main sequence stars in young open clusters. With the help of our robotic telescope STELLA on Tenerife, we can create time series photometry with outstanding nocturnal observation cadence over a month-long time line and millimag accuracy over a large field of view. Our investigations provide new deep color-brightness diagrams for the stellar clusters down to low star masses, supplemented by suitable isochrones from our current YaPSI models.